Patent US2238020A successfully refreshed from Google Patents.
US2238020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinylidene chloride copolymer
Assignee: Dow Chemical Co
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Filing: 1939-06-02
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Granted: 1941-04-08
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Expires: 1959-06-02
Abstract
No abstract record available.
Inventors
- 👤 Alden W Hanson
- 👤 William C Goggin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:33
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/08; C08F220/00; C08F220/02; C08F220/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-04-07 | 1944-10-07 | 1945-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-04-07 | 1948-10-07 | 1949-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-04-07 | 1952-10-07 | 1953-04-08 | $7700.00 | Window Closed / Lapsed |